I used this example to record a video, but there is no output. Any help, please:

import cv2 if __ name __ == " __ main __ ": # find the webcam capture = cv2.VideoCapture(0) # video recorder fourcc = cv2.cv.CV_FOURCC(*'XVID') # cv2.VideoWriter_fourcc() does not exist videoOut = cv2.VideoWriter("output.avi", fourcc, 20.0, (640, 480)) # record video while (capture.isOpened()): ret, frame = capture.read() if ret: videoOut.write(frame) cv2.imshow('Video Stream', frame) else: break # Tiny Pause key = cv2.waitKey(1) capture.release() videoOut.release() cv2.destroyAllWindows() 

I got this error:

HIGHGUI ERROR: V4L/V4L2: VIDIOC_S_CROP (Video Stream:2758): Gtk-WARNING **: cannot open display: